Intel 8253 - Page 294

Philips Semiconductors Linear Products Product specification
ADC0803/4-1CMOS 8-bit A/D converters
August 31, 1994
563
3-STATE TEST CIRCUITS AND WAVEFORMS (ADC0801-1)
t
r
90%
50%
10%
t
0H
10%
V
CC
GND
V
OH
GND
RD
DATA
OUTPUT
C
L
V
CC
DATA
OUTPUT
10K
C
L
CS
RD
t
r
90%
50%
10%
t
1H
90%
V
CC
GND
V
OH
GND
RD
DATA
OUTPUT
V
CC
10K
CS
RD
DATA
OUTPUT
V
CC
20ns
10pF
t
OH
t
1H
10pF
TIMING DIAGRAMS (All timing is measured from the 50% voltage points)
START
CONVERSION
CS
WR
t
WI
t
W(WR)L
ACTUAL INTERNAL
STATUS OF THE
CONVERTER
(LAST DATA WAS READ)
(LAST DATA WAS NOT READ)
INTR
INTR
CS
RD
DATA
OUTPUTS
INTR
RESET
t
RI
t
ACC
t
1H,
t
0H
THREE–STATE
1 TO 8 X 1/f
CLK
”NOT BUSY”
”BUSY”
INTERNAL T
C
DATA IS VALID IN
OUTPUT LATCHES
INT ASSERTED
1/2 T
CLK
NOTE
NOTE:
Read strobe must occur 8 clock periods (8/f
CLK
) after assertion of interrupt to guarantee reset of INTR.
Output Enable and Reset INTR